Oksana Grigorieva -- I'll Tell Everything About Mel

7/14/2010 5:05 PM PDT

Oksana Grigorieva -- I'll Tell Everything About Mel

Oksana Grigorieva was strategizing with her lawyers in Century City today -- getting ready for next week's big custody hearing withMel Gibson ... but before she walked into the office, she told photogs that she'll be tellin' the whole story.